Accrued Liabilities - Summary of Accrued Warranty Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Payables And Accruals [Abstract]
Beginning balance	$ 1,842	$ 2,322
Amortization of fair value adjustment of warranty liabilities acquired through acquisitions		(8)
Reduction of warranty liabilities assumed in connection with acquisitions	(119)	(29)
Warranty expense	530	149
Warranty charges	(14)	(293)
Ending balance	$ 2,239	$ 2,141